A plume heat flux and contaminant settling on-line correlation measurement device and method

Abstract

The present application relates to flow field testing technical field, more specifically, it particularly relates to a plume heat flow and pollutant deposition on-line simultaneous measurement device and method, the present application includes: the inside of the shell forms a one end open air inlet, for introducing the plume to be measured into the device; The heat flow measurement unit is arranged on the inclined surface at the end of the air inlet, the heat flow measurement unit is used for connecting the heat flow signal lead and outputing the potential difference U proportional to the plume heat flow; The pollutant deposition measurement unit is arranged on the bottom of the air inlet, the pollutant deposition measurement unit is used for receiving the deposition pollutant and causing the oscillation frequency change, and the frequency signal is outputted through the pollutant deposition signal lead; The heat flow measurement unit and the pollutant deposition measurement unit are isolated in structure, so as to realize the synchronous on-line measurement of the heat flow and the pollutant deposition mass at the same plume measurement position.The present application can realize the simultaneous measurement of plume heat flow and pollutant deposition, and obtain on-line measurement results.

Description

Technical Field

[0001] This invention relates to the field of flow field testing technology, and more specifically, to an online isotopic measurement device and method for plume heat flux and pollutant sedimentation. Background Technology

[0002] In fields such as aerospace engine testing, wind tunnel experiments, and industrial exhaust emission testing, measuring heat flux and pollutant deposition at specific locations within a plume is of great significance. As a fluid flow driven by thermal buoyancy or momentum, the core characteristics of a plume lie in the transfer and diffusion of thermal energy and the deposition of entrained pollutants. Accurate measurement of the heat flux distribution within a plume is crucial for assessing energy utilization efficiency, optimizing thermal equipment design, and predicting thermal environmental impacts. Furthermore, understanding the deposition location and amount of pollutants (such as harmful particulate matter and aerosols) directly affects equipment safety and lifespan, operator health and safety, and the formulation of pollution control strategies. Therefore, accurate measurement of these two parameters is of paramount importance.

[0003] Currently, the measurement of heat flux and contaminants in plumes relies on heat flux sensors and sedimentation collection plates, respectively. Heat flux sensors are relatively mature; both thermopile sensors based on the Seebeck effect and thermal resistance sensors based on heat transfer theory can acquire heat flux values. However, these contact-type heat flux meters can affect the flow field and interfere with the nearby sedimentation collection plate. The sedimentation collection plate is a device based on the principle of passive sedimentation. After being placed in the plume for a period of time, the mass of the measuring plate increases, allowing for the measurement of the amount of contaminants deposited during that time. This sensor can measure the amount of contaminant deposited, but its time resolution is low, only providing the total amount of contaminants over a given period. Furthermore, since the two sensors measure two different parameters separately, they cannot simultaneously measure heat flux and contaminants at the same plume location, which significantly limits their practical application. Summary of the Invention

[0004] This invention aims to at least partially solve one of the technical problems in related technologies. Therefore, the objective of this invention is to provide an online in-situ measurement device and method for plume heat flux and contaminant deposition, which can solve the problems in existing technologies where heat flux and contaminant deposition cannot be measured simultaneously at the same plume location, and where it is difficult to obtain real-time results for measuring contaminant deposition.

[0005] To achieve the above and other related objectives, the present invention provides an online isotopic measurement device for plume heat flux and pollutant deposition, comprising: The outer shell has an air intake channel with one end open inside, which is used to introduce the plume to be measured into the device. A heat flux measurement unit is disposed on the inclined surface at the end of the air intake duct. The heat flux measurement unit is used to connect the heat flux signal lead and output a potential difference U that is proportional to the heat flux of the plume. A pollutant settling measurement unit is installed at the bottom of the air intake duct. The pollutant settling measurement unit is used to receive settling pollutants and cause changes in the oscillation frequency, and outputs the frequency signal through the pollutant deposition signal lead. The heat flow measurement unit and the pollutant sedimentation measurement unit are structurally isolated from each other to achieve synchronous online measurement of heat flow and pollutant sedimentation mass at the same plume measurement location.

[0006] In one embodiment of the present invention, the heat flow measurement unit includes: A constantan foil sheet is disposed on the inclined surface at the end of the air intake duct, and the constantan foil sheet is used to sense the heat flow of the plume. A copper heat sink forms a thermopile with the constantan foil, which forms a circuit through the connection of copper wires; A copper wire, with its two ends connected to the contaminant deposition signal leads.

[0007] In one embodiment of the present invention, the pollutant sedimentation measurement unit includes: A quartz crystal is disposed at the bottom of the air intake duct, and the surface of the quartz crystal is used to receive settled pollutants and cause changes in the oscillation frequency; An oscillating circuit is electrically connected to the quartz wafer, and the frequency signal of the oscillating circuit is output through the contaminant deposition signal lead.

[0008] In one embodiment of the present invention, the inclined surface at the end of the air intake duct forms an angle of 15°–60° with the axis of the outer casing.

[0009] In one embodiment of the present invention, the constantan foil has a thickness of 10–60 μm.

[0010] In one embodiment of the present invention, the copper heat sink is a cylindrical oxygen-free copper block.

[0011] In one embodiment of the present invention, the outer shell is made of stainless steel.

[0012] This invention also provides an online in-situ measurement method for plume heat flux and pollutant sedimentation, including the above-mentioned online in-situ measurement device for plume heat flux and pollutant sedimentation, wherein the online in-situ measurement method for plume heat flux and pollutant sedimentation includes: S1. Install and fix the online in-situ measurement device for plume heat flux and pollutant deposition at the plume measurement location to be measured, and connect the heat flux signal lead and the pollutant deposition signal lead to the voltage data acquisition device and the frequency meter respectively. S2. The plume heat flow enters the online co-position measurement device of plume heat flow and pollutant sedimentation through the air inlet formed by the outer shell. The heat and pollutants carried are measured by the heat flow measurement unit and the pollutant sedimentation measurement unit, respectively. S3. Obtain the heat flux value from the potential difference of the heat flux signal lead; S4. Calculate the pollutant deposition mass from the oscillation frequency of the pollutant deposition signal lead.

[0013] In one embodiment of the present invention, obtaining the heat flux value from the potential difference of the heat flux signal lead in step S3 includes: , in, Indicates the heat flux value. This indicates the potential difference on the heat flow signal lead. This indicates the sensitivity of the heat transfer sensing structure.

[0014] In one embodiment of the present invention, calculating the contaminant deposition mass from the oscillation frequency of the contaminant deposition signal lead in step S4 includes: , in, For pollutant settling mass, The change in frequency The electrode thickness is on the surface of the quartz wafer. is the elastic stiffness coefficient of the quartz wafer. The density of the quartz wafer, This is the reference frequency for the quartz crystal.

[0015] As described above, the online isotopic measurement device and method for plume heat flux and pollutant sedimentation of the present invention has the following beneficial effects: The present invention provides an online in-situ measurement device for plume heat flux and pollutant deposition, comprising a housing, a heat flux measurement unit, a heat flux signal lead, a pollutant deposition measurement unit, and a pollutant deposition signal lead, which can realize in-situ measurement of plume heat flux and pollutant deposition and obtain online measurement results.

[0016] The present invention provides an online in-situ measurement device for plume heat flux and pollutant deposition, which collects plumes at specific locations through an air inlet with a wedge-shaped bottom surface. The device integrates non-interfering heat flux and pollutant deposition test structures, enabling in-situ, online measurement of the two physical quantities.

[0017] The present invention provides an online in-situ measurement device for plume heat flux and pollutant deposition, in which a thermopile and a quartz crystal are conformally integrated in the same wedge-shaped air inlet to obtain instantaneous heat flux and deposition quality, avoiding the positional errors and data splicing uncertainties caused by traditional separate probes. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of an online isotopic measurement device for plume heat flux and pollutant sedimentation according to an embodiment of the present invention.

[0019] The components include: 1. Outer shell; 2. Heat flow signal lead; 3. Contaminant deposition signal lead; 4. Constantan foil; 5. Copper heat sink; 6. Copper wire; 7. Quartz crystal wafer; 8. Oscillator circuit. Detailed Implementation

[0020] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0021] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the illustrations only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0022] Terms such as "first" or "second" may be used to describe various components, but these components are not limited by the terms described above. The terms described above are used to distinguish one component from another; for example, without departing from the scope of the concept according to this disclosure, a first component may be referred to as a second component, and similarly, a second component may be referred to as a first component.

[0023] Furthermore, "connected / linked" indicates that one component is directly electrically connected to another component or indirectly electrically connected through another component. Unless otherwise explicitly stated in the sentence, the singular form may include the plural form. Additionally, the terms "comprising / including" or "containing / including" as used in this specification indicate the presence or addition of one or more components, steps, operations, and elements. Specific structural or functional descriptions of examples of embodiments of the concepts disclosed in this specification are merely illustrative to describe examples of embodiments of the concepts, and examples of embodiments of the concepts can be implemented in various forms, but these descriptions are not limited to the examples of embodiments described in this specification.

[0024] Based on the concept, various modifications and changes can be applied to examples of embodiments, such that examples of embodiments will be illustrated in the accompanying drawings and described in the specification. However, examples of embodiments based on the concept are not limited to specific embodiments, but include all changes, equivalents, or substitutions included within the spirit and scope of this disclosure.

[0025] It should be understood that when describing an element as "connected" or "linked" to another element, the element may be directly connected or linked to the other element, or it may be connected or linked to the other element via a third element. Conversely, it should be understood that when an element is described as "directly connected to" or "directly linked to" another element, no other element is placed between them. Other expressions describing relationships between components (i.e., "between" and "directly between" or "adjacent to" and "directly adjacent to") need to be interpreted in the same way.

[0026] The terminology used in this specification is for the purpose of describing specific examples of implementations only and is not intended to limit this disclosure. The singular form may include the plural form unless there is an explicit contrary meaning in the context. It should be understood in this specification that the terms "comprising" or "having" indicate the presence of the features, quantities, steps, operations, components, parts, or combinations thereof described in the specification, but do not preclude the possibility of the presence or addition of one or more other features, quantities, steps, operations, components, parts, or combinations thereof.

[0027] Unless otherwise defined, all terms used herein (including technical or scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art. If a term is not clearly defined in a common dictionary in this specification, it shall be interpreted as having the same meaning as in the context of the relevant art, and not as an ideal or overly formal meaning.

[0028] Descriptions of known components and processing techniques may be omitted to avoid unnecessarily obscuring the embodiments of this disclosure.

[0029] Throughout this specification, the same reference numerals refer to the same elements. Therefore, even if a reference numeral is not mentioned or described with reference to one drawing, it may be mentioned or described with reference to another drawing. Furthermore, even if a reference numeral is not shown in one drawing, it may be mentioned or described with reference to another drawing.

[0030] Additionally, the logic level of a signal may be different from or opposite to the logic level described. For example, a signal described as having a logic "high" level may optionally have a logic "low" level, and a signal described as having a logic "low" level may optionally have a logic "high" level.

[0031] The embodiments of this disclosure will now be described in detail with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been provided in the embodiments of this disclosure to facilitate a better understanding of the disclosure. However, the technical solutions claimed in this disclosure can be implemented even without these technical details and various variations and modifications based on the following embodiments.

[0032] Please see Figure 1 , Figure 1 This is a schematic diagram of the structure of an online co-position measurement device for plume heat flux and pollutant sedimentation according to an embodiment of the present invention. The present invention provides an online co-position measurement device for plume heat flux and pollutant sedimentation, comprising: an air inlet duct with one open end formed inside the outer shell 1 for introducing the plume to be measured into the device; a heat flux measurement unit disposed on the inclined surface at the end of the air inlet duct, the heat flux measurement unit being used to connect to a heat flux signal lead 2 and output a potential difference U proportional to the plume heat flux; and a pollutant sedimentation measurement unit disposed at the bottom of the air inlet duct, the pollutant sedimentation measurement unit being used to receive sedimented pollutants and cause a change in oscillation frequency, and outputting the frequency signal via a pollutant sedimentation signal lead 3; the heat flux measurement unit and the pollutant sedimentation measurement unit are structurally isolated from each other to achieve synchronous online measurement of heat flux and pollutant sedimentation mass at the same plume measurement location.

[0033] Specifically, the heat flow measurement unit includes: a constantan foil 4 disposed on the inclined surface at the end of the air intake duct, the constantan foil 4 being used to sense the heat flow of the plume; a copper heat sink 5 forming a thermopile with the constantan foil 4, forming a circuit under the connection of copper wire 6; and the two ends of the copper wire 6 being connected to the contaminant deposition signal lead 3.

[0034] Specifically, the pollutant deposition measurement unit includes: a quartz crystal 7 disposed at the bottom of the air inlet, the surface of the quartz crystal 7 being used to receive deposited pollutants and cause changes in oscillation frequency; an oscillation circuit 8 being electrically connected to the quartz crystal 7, the frequency signal of the oscillation circuit 8 being output through the pollutant deposition signal lead 3.

[0035] Specifically, the inclined surface at the end of the air intake duct forms an angle of 15°–60° with the axis of the outer casing 1. Preferably, the inclined surface at the end of the air intake duct forms an angle of 15°, 30°, 45°, 50°, or 60° with the axis of the outer casing 1.

[0036] Specifically, the thickness of the constantan foil 4 is 10–60 μm. Preferably, the thickness of the constantan foil 4 can be, but is not limited to, 10 μm, 20 μm, 30 μm, 40 μm, 50 μm, or 60 μm.

[0037] Specifically, the copper heat sink 5 is a cylindrical oxygen-free copper block.

[0038] Specifically, the outer shell 1 is made of stainless steel.

[0039] In one embodiment of the present invention, the online isotopic measurement device for plume heat flux and pollutant deposition comprises a housing 1, a constantan foil 4, a copper wire 6, a copper heat sink 5, a quartz crystal 7, an oscillation circuit 8, and signal leads. A cross-sectional view of the device is attached. Figure 1 As shown. The outer casing 1 supports and protects the internal sensor and forms the air intake for the plume. A constantan foil 4 is placed on the inclined surface at the end of the air intake to sense the heat flow of the plume. The copper heat sink 5 and the constantan foil 4 form a thermopile, which, connected by copper wire 6, forms a circuit. Under the heating of the heat flow, a potential difference exists in the circuit. Measuring this potential difference through the signal leads yields the heat flow value, i.e.: ,in, Indicates the heat flux value. This indicates the potential difference on lead 2 of the heat flow signal. This indicates the sensitivity of the heat transfer sensing structure.

[0040] The quartz crystal 7, oscillation circuit 8, and contaminant deposition signal lead 3 located below the air intake constitute the contaminant deposition measurement structure. The plume entering the measuring device carries contaminants, which stagnate at the bottom of the air intake, causing the contaminants to settle onto the quartz crystal 7. The quartz crystal 7 is connected to the oscillation circuit 8, and its oscillation frequency is related to the mass of contaminants on the quartz crystal 7; the more contaminants, the slower the oscillation frequency. The mass of the contaminants can be calculated using the following formula: , in, For pollutant settling mass, The change in frequency The electrode thickness is on the surface of quartz wafer 7. The elastic stiffness coefficient of quartz wafer 7. The density of quartz wafer 7, This is the reference frequency for quartz crystal 7.

[0041] This invention utilizes a heat flux sensor and a pollutant deposition sensor in an online in-situ measurement of plume heat flux and pollutant deposition to measure the heat flux and pollutant deposition amount of the plume entering the device.

[0042] Similar in principle to the online in-situ measurement device for plume heat flux and pollutant sedimentation of the present invention, the present invention also provides an online in-situ measurement method for plume heat flux and pollutant sedimentation, including the above-mentioned online in-situ measurement device for plume heat flux and pollutant sedimentation, wherein the online in-situ measurement method for plume heat flux and pollutant sedimentation includes: S1. Install and fix the online co-position measurement device for plume heat flux and pollutant deposition at the measurement location of the plume to be measured, and connect the heat flux signal lead 2 and the pollutant deposition signal lead 3 to the voltage data acquisition device and the frequency meter, respectively.

[0043] S2. The plume heat flow enters the online co-position measurement device of plume heat flow and pollutant sedimentation from the air intake formed by the outer shell 1. The heat and pollutants carried are measured by the heat flow measurement unit and the pollutant sedimentation measurement unit, respectively.

[0044] S3. Obtain the heat flow value from the potential difference of the heat flow signal lead 2.

[0045] S4. Calculate the pollutant deposition mass from the oscillation frequency of the pollutant deposition signal lead 3.

[0046] Specifically, obtaining the heat flux value from the potential difference of the heat flux signal lead 2 in step S3 includes: , in, Indicates the heat flux value. This indicates the potential difference on lead 2 of the heat flow signal. This indicates the sensitivity of the heat transfer sensing structure.

[0047] Specifically, the calculation of the pollutant deposition mass from the oscillation frequency of the pollutant deposition signal lead 3 in step S4 includes: , in, For pollutant settling mass, The change in frequency The electrode thickness is on the surface of quartz wafer 7. The elastic stiffness coefficient of quartz wafer 7. The density of quartz wafer 7, This is the reference frequency for quartz crystal 7.

[0048] In summary, the present invention provides an online in-situ measurement device for plume heat flux and pollutant deposition, comprising a housing, a heat flux measurement unit, a heat flux signal lead, a pollutant deposition measurement unit, and a pollutant deposition signal lead, which can realize in-situ measurement of plume heat flux and pollutant deposition and obtain online measurement results.

[0049] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. An online isotopic measurement device for plume heat flux and pollutant deposition, characterized in that, include: The outer shell (1) has an air inlet with one end open inside, which is used to introduce the plume to be measured into the device; A heat flow measurement unit is provided on the inclined surface at the end of the air intake. The heat flow measurement unit is used to connect the heat flow signal lead (2) and output a potential difference U that is proportional to the heat flow of the plume. A pollutant settling measurement unit is installed at the bottom of the air intake. The pollutant settling measurement unit is used to receive settling pollutants and cause changes in oscillation frequency, and outputs the frequency signal through the pollutant deposition signal lead (3). The heat flow measurement unit and the pollutant sedimentation measurement unit are structurally isolated from each other to achieve synchronous online measurement of heat flow and pollutant sedimentation mass at the same plume measurement location.

2. The online isotopic measurement device for plume heat flux and pollutant deposition according to claim 1, characterized in that, The heat flow measurement unit includes: Constantan foil (4) is disposed on the inclined surface at the end of the air intake duct, and the constantan foil (4) is used to sense the heat flow of the plume; A copper heat sink (5) forms a thermopile with the constantan foil (4), and forms a circuit under the connection of copper wire (6); A copper wire (6) is connected at both ends to the pollutant deposition signal lead (3).

3. The online isotopic measurement device for plume heat flux and pollutant deposition according to claim 2, characterized in that, The pollutant sedimentation measurement unit includes: A quartz crystal (7) is disposed at the bottom of the air intake channel. The surface of the quartz crystal (7) is used to receive settled pollutants and cause changes in the oscillation frequency. An oscillating circuit (8) is electrically connected to the quartz wafer (7), and the frequency signal of the oscillating circuit (8) is output through the contaminant deposition signal lead (3).

4. The online in-situ measurement device for plume heat flux and pollutant deposition according to claim 3, characterized in that: The inclined surface at the end of the air intake duct forms an angle of 15°–60° with the axis of the outer casing (1).

5. The online in-situ measurement device for plume heat flux and pollutant deposition according to claim 3, characterized in that: The constantan foil (4) has a thickness of 10–60 μm.

6. The online isotopic measurement device for plume heat flux and pollutant deposition according to claim 3, characterized in that: The copper heat sink (5) is a cylindrical oxygen-free copper block.

7. The online isotopic measurement device for plume heat flux and pollutant deposition according to claim 3, characterized in that: The outer shell (1) is made of stainless steel.

8. A method for online in-situ measurement of plume heat flux and pollutant deposition, characterized in that, The online isotopic measurement device for plume heat flux and pollutant deposition, as described in any one of claims 1 to 7, comprises the following method: S1. Install and fix the online in-situ measurement device for plume heat flux and pollutant deposition at the plume measurement location, and connect the heat flux signal lead (2) and the pollutant deposition signal lead (3) to the voltage data acquisition device and the frequency meter respectively; S2. The plume heat flow enters the online co-position measurement device of plume heat flow and pollutant sedimentation from the air inlet formed by the outer shell (1). The heat and pollutants carried are measured by the heat flow measurement unit and the pollutant sedimentation measurement unit, respectively. S3. Obtain the heat flow value from the potential difference of the heat flow signal lead (2); S4. Calculate the pollutant deposition mass from the oscillation frequency of the pollutant deposition signal lead (3).

9. The method for online in-situ measurement of plume heat flux and pollutant deposition according to claim 8, characterized in that, Step S3, obtaining the heat flow value from the potential difference of the heat flow signal lead (2), includes: ， in, Indicates the heat flux value. This represents the potential difference on the heat flow signal lead (2). This indicates the sensitivity of the heat transfer sensing structure.

10. The method for online in-situ measurement of plume heat flux and pollutant deposition according to claim 9, characterized in that, The calculation of the contaminant deposition mass from the oscillation frequency of the contaminant deposition signal lead (3) in step S4 includes: ， in, For pollutant settling mass, The change in frequency The electrode thickness on the surface of the quartz wafer (7) is... The elastic stiffness coefficient of the quartz wafer (7) is given. The density of the quartz wafer (7) The reference frequency of the quartz crystal (7) is given.

Images